Datasheet Single-chip Type with Built-in FET Switching Regulator Series 1.0A, Step-down Switching regulators with Built-in Power MOSFET BU90104GWZ General Description The BU90104GWZ are a high efficiency 6MHz synchronous step-down switching regulator with ultra low current PFM mode. It provides up to 1.0A load current and an input voltage range from 3.0V to 5.5V, optimized for battery powered portable applications. BU90104GWZ has a mode control pin that allows the user to select Forced PWM(Pulse Width Modulation) mode or PFM(Pulse Frequency Modulation) and PWM auto change mode utilized power save operation at light load current. Applications Smart phones, Cell phones, Portable applications and Micro DC/DC modules, USB accessories Package(s) UCSP35L1 W(Typ.) x D(Typ.) x H(Max.) 1.30mm x 0.90mm x 0.40mm Typical Application Circuit(s) Features Fast transient response Automatic PFM/PWM operation Forced PWM operation Internal Soft Start Under voltage lockout Over current protection Thermal shutdown Figure 1. Typical Application Circuit(s) Lineup Part No. Output voltage Input voltage Switching frequency BU90104GWZ 1.80V 2.3V to 5.5V 4.8MHz to 6.0MHz Pin Configuration(s) (BOTTOM VIEW) MODE=H Automatic PFM/PWM Forced PWM Pin Description(s) Figure 2. Pin Configuration(s) Product structureSilicon monolithic integrated circuit www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211114001 Operating mode MODE=L Pin No. Symbol Function A1 VIN Power supply input pin A2 EN Enable pin A3 GND B1 MODE Forced PWM mode pin B2 LX Inductor connection pin B3 FB Feedback voltage input pin GND pin This product is not designed protection against radioactive rays 1/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Block Diagram(s) Figure 3. Block Diagram(s) Description of Block(s) The BU90104GWZ are a synchronous step-down DC/DC converter that achieves fast transient response from light load to heavy load by hysteretic PWM control system and current constant PFM control system. PWM control BU90104GWZ operates by hysteretic PWM control. This scheme ensures fast switching, high efficiency, and fast transient response. When the output voltage is below the VREF voltage, the error comparator output is low to high and turning on P-channel MOSFET until above the VREF voltage and minimum on time. PFM control At light load the regulator and MODE=low, the regulator operates with reduced switching frequency and improves the efficiency. During PFM operation, the output voltage slightly higher than typical output voltage. Figure 4. Operation of PFM mode and PWM mode www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 2/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Description of operations 1) Shutdown If the EN input pin set to low (<0.4V), all circuit are shut down and the regulator is standby mode. Do not leave the EN pin floating. 2) Soft start function The regulator has a soft start circuit that reduces in-rush current at start-up. Typical start up times with a 4.7uF output capacitor is (400usec). 3) Current limit The BU90104GWZ has a current limit circuit that protects itself and external components during overload condition. 4) UVLO The BU90104GWZ has an Under Voltage Lock Out circuit that turn off device when VIN>2.05V(typ.) 5) FORCED PWM MODE Setting MODE pin high (>1.4V) places the regulator in forced PWM.This control provides noise reduction and output stability. Do not leave the MODE pin floating. 6) TSD The BU90104GWZ has a thermal shutdown feature to protect the device if the junction temperature exceeds 150. In thermal shutdown, the DRIVER is disabled. This circuit is only to cut off the IC from thermal runaway, and has not been design to protect or guarantee the IC. Therefore, the user should not plan to activate this circuit with continued operation in mind. Absolute Maximum Ratings (Ta=25) Parameter Symbol Rating Unit VIN 7 V VEN, VFB, VLX, VMODE 7 V Pd 0.39 *1 W Operating temperature range Topr -40 to +85 Storage temperature range Tstg -55 to +125 Tjmax +125 Maximum input power supply voltage Maximum voltage at EN, FB, LX, MODE Power dissipation Junction temperature (*1) When mounted on the specified PCB (55mm x 63mm), Deducted by 3.9m W/c when used over Ta=25c Recommended Operating Rating(s) Parameter Symbol Input voltage VIN www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 Rating 3/14 Min. Typ. Max. 2.3 - 5.5 Unit V TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Electrical Characteristic(s) (unless otherwise specified VIN=3.6V, Ta=25) Min. Rating Typ. Max. 1.764 1.800 1.836 IoutMAX1 IoutMAX2 IoutMAX3 1.764 - 1.800 - 1.854 1.0 0.8 0.6 A A A Tss 200 400 800 usec fosc 4.8 5.4 6.0 MHz RonP1 RonP2 RonN1 RonN2 - 250 300 220 250 400 450 350 380 mOhm mOhm mOhm mOhm Operation VENH 1.4 - VIN V Non Operation VENL 0 - 0.4 V Operation VMODEH 1.4 - VIN V Forced PWM Non Operation VMODEL 0 - 0.4 V Automatic PFM/PWM Uvth Uvhy 1.95 50 2.05 100 2.15 150 V mV ILIMIT 1.5 1.7 1.9 A DRES 15 30 60 Ohm Operating quiescent current IINS1 - 45 65 uA EN:H, MODE:L, VOUT=3.6V forced Not switching Shutdown current SHD - 0 1 uA EN=0V Item Symbol Unit Condition Switching regulator Output voltage accuracy Maximum load current VOUTA V MODE:H(PWM Operation) MODE:L(PFM Operation) 3.0VVIN5.5V 2.7VVIN3.0V 2.3VVIN2.7V Soft start Soft start time Frequency control Switching frequency No load, MODE:H Driver PchFET on resistance NchFET on resistance - VIN=5.0V VIN=3.6V VIN=5.0V VIN=3.6V Control EN pin control voltage MODE pin control voltage UVLO Protect threshold voltage Hysteresis Current limit Current limit threshold PMOS current detect, Open loop Output discharge Output discharge resistance EN=0V Circuit current www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 4/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Electrical characteristic curves (Reference data) Parts L:LQM21MPN1R0NG0 (2.0mmx1.6mmx1.0mm Murata) COUT:GRM155R60J475M(1.0mmx0.5mmx0.5mm Murata) EN 2V/div EN 2V/div VOUT 1V/div 100us VOUT 500mV/div 100us IL 200mA/div Figure 5. Start up Figure 6. Shut down Vout 50mV/div ac coupled Vout 50mV/div ac coupled 20us IOUT 100mA/div 20us IOUT 200mA/div Figure 7. Load transient response 5mA to 50mA tr=tf=100ns, MODE : Low www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 Figure 8. Load transient response 50mA to 350mA tr=tf=100ns, MODE : Low 5/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Vout 20mV/div ac coupled Vout 50mV/div ac coupled LX 2V/div 20us 1us IOUT 200mA/div IL 200mA/div Figure 10. PFM mode Operation Iout=50mA Figure 9. Load transient response 150mA to 500mA tr=tf=100ns, MODE : High Vout 20mV/div ac coupled MODE 2V/div LX 2V/div 4us Vout 50mV/div ac coupled 200ns IL 200mA/div IL 200mA/div Figure 11. PWM mode Operation Iout=100mA www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 Figure 12. Mode Change Response MODE : High to Low 6/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ 100 90 MODE 2V/div 4us 80 Efficiency [%] 70 Vout 50mV/div ac coupled 60 50 40 30 VIN=2.7V 20 IL 200mA/div VIN=3.6V 10 VIN=4.2V 0 0.1 Figure 13. Mode Change Response MODE : Low to High 1 10 100 Load current [mA] 1000 Figure 14. Efficiency vs Load current PWM/PFM Auto mode 1.854 VIN=2.7V 1.836 Output Voltage[V] VIN=3.6V VIN=4.2V 1.818 1.800 1.782 1.764 0 200 400 600 Load current[mA] 800 1000 Figure 15. Load regulation PWM/PFM Auto mode www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 7/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ PC Board layout The suggested PCB layout for the BU90104GWZ are shown in Figure. The following guidelines should be used to ensure a proper layout. 1) The input capacitor CIN should be connect as closely possible to VIN pin and GND pin. 2) From the output voltage to the FB pin line should be as separate as possible. 3) COUT and L should be connected as closely as possible. The connection of L to the LX pin should be as short as possible. Figure 16. PCB layout External parts selection Inductor selection The inductance significantly depends on output ripple current. As shown by following equation, the ripple current decreases as the inductor and/or switching frequency increase. IL= (VIN-VOUT)xVOUT LxVINxf f: switching frequency IL: inductor current ripple L: inductance As a minimum requirement, the DC current rating of the inductor should be equal to the maximum load current plus half of the inductor current ripple as shown by the following equation. ILPEAK= IOUTMAX + IL 2 www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 8/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ 1) Recommended inductor selection Iout1A LQM2MPN1R0NG0 (2.0mmx1.6mmx1.0mm Murata) MIPSZ2016D1R0FH (2.0mmx1.6mmx1.0mm FDK) DFE252012C1R0 (2.5mmx2.0mmx1.2mm TOKO) DFE252010C1R0 (2.5mmx2.0mmx1.0mm TOKO) Iout0.6A LQM21PN1R0NGC (2.0mmx1.2mmx1.0mm Murata) MIPSZ2012D1R0 (2.0mmx1.2mmx1.0mm FDK) MIPSTZ1608D1R0 (1.6mmx0.8mmx0.8mm FDK) MLP2012H1R0M (2.0mmx1.2mmx1.0mm TDK) CKP2012N1R0N (2.0mmx1.2mmx1.0mm Taiyo Yuden) 2) Recommended input capacitor(CIN) selection GRM155R60J225M (1.0mmx0.5mmx0.5mm Murata) GRM155R60J475M (1.0mmx0.5mmx0.5mm Murata) GRM155R60G106M (1.0mmx0.5mmx0.5mm Murata) 3) Recommended output capacitor(COUT) selection GRM155R60J475M (1.0mmx0.5mmx0.5mm Murata) GRM155R60G106M (1.0mmx0.5mmx0.5mm Murata) Cautions on the output capacitor selection The BU90104GWZ is designed to fixed soft-start time and operate with a maximum output capacitance of (100uF). If the capacitance connected to the output is larger than (100uF), an overshoot of the output voltage will be caused. It is possible to cause damage on the connected device. www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 9/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ I/O equivalence circuit(s) A2 B1 EN VIN B2 VIN LX B3 VIN www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 MODE FB VIN 10/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Caution of use 1) Absolute maximum ratings An excess in the absolute maximum rating, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2) GND voltage The potential of GND pin must be minimum potential in all condition. As an exception, the circuit design allows voltages up to -0.3 V to be applied to the IC pin. 3) Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. 4) Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if pins are shorted together. 5) Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. 6) Mutual impedance Power supply and ground wiring should reflect consideration of the need to lower mutual impedance and minimize ripple as much as possible (by making wiring as short and thick as possible or rejecting ripple by incorporating inductance and capacitance). 7) Thermal shutdown Circuit (TSD Circuit) This model IC has a built-in TSD circuit. This circuit is only to cut off the IC from thermal runaway, and has not been design to protect or guarantee the IC. Therefore, the user should not plan to activate this circuit with continued operation in mind. 8) Regarding input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, as shown in the figures below, the relation between each potential is as follows: When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes can occur inevitable in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin, should not be used. 9) Disturbance light In a device where a portion of silicon is exposed to light such as in a WL-CSP, IC characteristics may be affected due to photoelectric effect. For this reason, it is recommended to come up with countermeasures that will prevent the chip from being exposed to light. Status of this document The Japanese version of this document is formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document formal version takes priority www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 11/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Ordering Information B U 9 0 1 Part Number 0 4 G W Z Package GWZ: UCSP35L1 E2 Packaging and forming specification E2: Embossed tape and reel (UCSP35L1) Marking Diagram(s)(TOP VIEW) www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 12/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Physical Dimension Tape and Reel Information Package Name UCSP35L1 ( BU90104GWZ ) Unitmm < Tape and Reel Information > Tape Embossed carrier tape Quantity 3000pcs Direction of feed E2 The direction is the pin 1 of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 1234 1234 Reel www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 1234 1234 1pin 13/14 1234 1234 Direction of feed TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet BU90104GWZ Revision History Date Revision 22.Jul.2015 001 Changes New Release. www.rohm.com (c) 2015 ROHM Co., Ltd. All rights reserved. TSZ2211115001 14/14 TSZ02201-0F1F0AG00080-1-2 22.Jul.2015 Rev.001 Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you (Note 1) , transport intend to use our Products in devices requiring extremely high reliability (such as medical equipment equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property ("Specific Applications"), please consult with the ROHM sales representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM's Products for Specific Applications. (Note1) Medical Equipment Classification of the Specific Applications JAPAN USA EU CHINA CLASS CLASSb CLASS CLASS CLASS CLASS 2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our Products may cause. The following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. Our Products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any ROHM's Products under any special or extraordinary environments or conditions. If you intend to use our Products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust [c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves [e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items [f] Sealing or coating our Products with resin or other coating materials [g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the Products in places subject to dew condensation 4. The Products are not subject to radiation-proof design. 5. Please verify and confirm characteristics of the final or mounted products in using the Products. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8. Confirm that operation temperature is within the specified range described in the product specification. 9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Precaution for Mounting / Circuit board design 1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice-PGA-E (c) 2015 ROHM Co., Ltd. All rights reserved. Rev.001 Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. Therefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. Precaution for Electrostatic This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). Precaution for Storage / Transportation 1. Product performance and soldered connections may deteriorate if the Products are stored in the places where: [a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] the temperature or humidity exceeds those recommended by ROHM [c] the Products are exposed to direct sunshine or condensation [d] the Products are exposed to high Electrostatic 2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is exceeding the recommended storage time period. 3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of which storage time is exceeding the recommended storage time period. Precaution for Product Label QR code printed on ROHM Products label is for ROHM's internal use only. Precaution for Disposition When disposing Products please dispose them properly using an authorized industry waste company. Precaution for Foreign Exchange and Foreign Trade act Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign trade act, please consult with ROHM in case of export. Precaution Regarding Intellectual Property Rights 1. All information and data including but not limited to application example contained in this document is for reference only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. 2. ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the Products with other articles such as components, circuits, systems or external equipment (including software). 3. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to manufacture or sell products containing the Products, subject to the terms and conditions herein. Other Precaution 1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM. 2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of ROHM. 3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the Products or this document for any military purposes, including but not limited to, the development of mass-destruction weapons. 4. The proper names of companies or products described in this document are trademarks or registered trademarks of ROHM, its affiliated companies or third parties. Notice-PGA-E (c) 2015 ROHM Co., Ltd. All rights reserved. Rev.001 Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM's Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using ROHM's Products, please confirm the la test information with a ROHM sale s representative. 3. The information contained in this doc ument is provi ded on an "as is" basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice - WE (c) 2015 ROHM Co., Ltd. All rights reserved. Rev.001 Datasheet bu90104gwz - Web Page Buy Distribution Inventory Part Number Package Unit Quantity Minimum Package Quantity Packing Type Constitution Materials List RoHS bu90104gwz UCSP35L1 3000 3000 Taping inquiry Yes